JP4054157B2 - Planographic printing plate interleaving paper, planographic printing plate contact member, and planographic printing plate packaging structure - Google Patents

Planographic printing plate interleaving paper, planographic printing plate contact member, and planographic printing plate packaging structure Download PDF

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Publication number
JP4054157B2
JP4054157B2 JP2000058515A JP2000058515A JP4054157B2 JP 4054157 B2 JP4054157 B2 JP 4054157B2 JP 2000058515 A JP2000058515 A JP 2000058515A JP 2000058515 A JP2000058515 A JP 2000058515A JP 4054157 B2 JP4054157 B2 JP 4054157B2
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Prior art keywords
printing plate
lithographic printing
contact
planographic printing
static friction
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Expired - Fee Related
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JP2000058515A
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Japanese (ja)
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JP2001246869A (en
Inventor
孝之 碓井
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Fujifilm Corp
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Fujifilm Corp
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Priority to JP2000058515A priority Critical patent/JP4054157B2/en
Priority to EP01104193A priority patent/EP1136282B1/en
Priority to AT01104193T priority patent/ATE380118T1/en
Priority to DE60131692T priority patent/DE60131692T2/en
Priority to CNB011092793A priority patent/CN1223495C/en
Priority to US09/797,774 priority patent/US6551696B2/en
Publication of JP2001246869A publication Critical patent/JP2001246869A/en
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Publication of JP4054157B2 publication Critical patent/JP4054157B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D57/00—Internal frames or supports for flexible articles, e.g. stiffeners; Separators for articles packaged in stacks or groups, e.g. for preventing adhesion of sticky articles
    • B65D57/002—Separators for articles packaged in stacks or groups, e.g. stacked or nested
    • B65D57/003—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles
    • B65D57/004—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles the articles being substantially flat panels, e.g. wooden planks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31993—Of paper

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Packages (AREA)
  • Packaging Frangible Articles (AREA)

Abstract

A protective cardboard for planographic printing plates has a cardboard main body, a moisture-proofing layer on both surfaces of the cardboard main body, and an adhering paper adhered onto the moisture-proofing layer. By the adhering paper contacting an interleaf sheet, a coefficient Y of static friction between the protective cardboard and the interleaf sheet is equal to or less than a coefficient X of static friction between the interleaf sheet and an image forming surface of the planographic printing paper (i.e., Y</=X). <IMAGE>

Description

【０００１】
【発明の属する技術分野】
本発明は、平版印刷版用合紙、平版印刷版用当て部材及び平版印刷版包装構造に関する。
【０００２】
【従来の技術】
近年の製版法（電子写真製版法を含む）では、製版工程の自動化を容易にすべく、感光性印刷版や感熱性印刷板等の平版印刷版が広く用いられている。平版印刷版は、一般にシート状或いはコイル状のアルミニウム板等の支持体に、例えば、砂目立て、陽極酸化、シリケート処理、その他化成処理等の表面処理を単独又は適宜組み合わせて行い、次いで、感光層又は感熱層（以下、これらをまとめて「塗布膜」といい、塗布膜が塗布された面を「画像形成面」、塗布膜が形成されていない面を「非画像形成面」という）の塗布、乾燥処理を行った後に所望のサイズに切断されることで製造される。
【０００３】
この平版印刷版は、露光、現像処理、ガム引き等の製版処理が行われ、印刷機にセットされ、インクが塗布されることで、紙面に文字、画像等が印刷される。
【０００４】
ところで、平版印刷版は、その塗布膜を保護するために、合紙と呼ばれる紙を画像形成面（塗布膜）に接触させることがある。特に、平版印刷版を効率よく荷扱いするために、複数の平版印刷版を厚み方向に積層して平版印刷版性の積層束を構成した状態で荷扱いすることがあるが、この場合は、例えば上記した合紙を画像形成面に接触するようにして平版印刷版と交互に積層し、さらに平版印刷版の積層方向端面や所定枚数ごとに保護用の厚紙（「当てボール」と呼ばれる）を配置して積層束を構成することで、画像形成面（塗布膜）を保護することが多い。
【０００５】
ところが、このような積層束において、平版印刷版の画像形成面と合紙との静摩擦係数や、合紙と保護用厚紙との静摩擦係数が小さいと、積層束を運搬等する場合の振動等によって荷崩れしたり、合紙や保護用厚紙が平版印刷版に対して横ズレ（平版印刷版の画像形成面に沿った方向へのズレ）して画像形成面が損傷を受けたりすることがある。
【０００６】
また、最近ではレーザーで描画する感光又は感熱タイプ（以下、「レーザー露光タイプ」という）の平版印刷版がある。このようなレーザー露光タイプの平版印刷版において、前述の保護用厚紙を使用して積層束を構成する場合、塗布膜の特性によっては、保護用厚紙に含まれた水分が塗布膜を変質させてしまうおそれがある。このため、必要に応じて防湿層が設けられた保護用厚紙が使用されることがある。防湿層としては、一般的に使用されている保護用厚紙に、低密度ポリエチレン（ＬＤＰＥ）の層を張りつけた構造のものが使用されることが多い。
【０００７】
ところが、このようなＬＤＰＥ層を張りつけた保護用厚紙を使用して構成された積層束を荷扱いすると、ＬＤＰＥ層と合紙との静摩擦係数が、合紙と平版印刷版の画像形成面との静摩擦係数よりも相対的に大きいため、荷扱い時の振動等によって合紙と保護用厚紙とが一体で平版印刷版に対して横ズレする。この横ズレにより、画像形成面が損傷を受ける場合がある。
【０００８】
【発明が解決しようとする課題】
本発明は、上記事実を考慮し、平版印刷版の画像形成面に対する平版印刷版用合紙の横ズレを防止して、画像形成面の損傷を確実に防止できる平版印刷版用合紙、平版印刷版用当て部材及び平版印刷版包装構造を得ることを課題とする。
【０００９】
【課題を解決するための手段】
請求項１に記載の発明では、平版印刷版を包装した状態で平版印刷版の塗布膜が形成された画像形成面に接触される平版印刷版接触面と、前記平版印刷版接触面の反対側に配置された平版印刷版当て部材に接触する当て部材接触面と、を有し、前記平版印刷版用当て部材と前記当て部材接触面との静摩擦係数が前記平版印刷版接触面と前記画像形成面との静摩擦係数以下となるように平版印刷版接触面及び当て部材接触面の表面性状が設定されていることを特徴とする。
【００１０】
すなわち、請求項１の平版印刷版用合紙では、平版印刷版を包装した状態で平版印刷版接触面が平版印刷版の画像形成面に接触し、画像形成面（塗布膜）を保護する。
【００１１】
また、包装状態で平版印刷版接触面の反対側に平版印刷版当て部材が配置されることで、当て部材接触面に平版印刷版当て部材が接触する。
【００１２】
ここで、本発明の平版印刷版用合紙は、平版印刷版用当て部材と当て部材接触面との静摩擦係数が平版印刷版接触面と画像形成面との静摩擦係数以下となるように、平版印刷版接触面及び当て部材接触面の表面性状が設定されている。このため、例えば荷扱い時等での外力や振動等によって平版印刷版用当て部材と平版印刷版との間に横ズレが生じた場合に、平版印刷版用合紙は平版印刷版に対して横ズレせず、平版印刷版に対して平版印刷版用合紙が横ズレすることによる画層形成面の損傷を確実に防止できる。
【００１３】
請求項２に記載の発明では、平版印刷版の塗布膜が形成された画像形成面に平版印刷版用合紙が接触された状態で、この平版印刷版用合紙の両面のうち平版印刷版の画像形成面が接触する面との反対側の面に接触されて平版印刷版を保護する平版印刷版用当て部材であって、前記平版印刷版用合紙と前記平版印刷版用当て部材との静摩擦係数が前記平版印刷版の画像形成面と平版印刷版用合紙と静摩擦係以下となるように表面性状が設定された合紙接触面、を有することを特徴とする。
【００１４】
すなわち、請求項２の平版印刷版用当て部材は、平版印刷版の画像形成面に接触された平版印刷版用合紙に対して、平版印刷版用合紙の両面のうち平版印刷版の画像形成面が接触する面の反対側の面に接触し、平版印刷版を保護する。
【００１５】
ここで、この平版印刷版用当て部材は、平版印刷版用合紙と平版印刷版用当て部材との静摩擦係数が平版印刷版の画像形成面と平版印刷版用合紙との静摩擦係以下となるように表面性状が設定されている。このため、例えば荷扱い時等の外力や振動等によって平版印刷版用当て部材と平版印刷版との間に横ズレが生じた場合に、平版印刷版用合紙は平版印刷版に対して横ズレせず、平版印刷版に対して平版印刷版用合紙が横ズレすることによる画層形成面の損傷を確実に防止できる。
【００１６】
請求項３に記載の発明では、請求項２に記載の発明において、前記合紙接触面が、前記平版印刷版用合紙に対して前記平版印刷版の画像形成面と前記平版印刷版用合紙との静摩擦係数以下の静摩擦係数を有する貼着部材を、前記平版印刷版用を構成する当て部材本体に貼着することにより構成されていることを特徴とする。
【００１７】
すなわち、貼着部材は、平版印刷版用合紙に対して平版印刷版の画像形成面と平版印刷版用合紙との静摩擦係数以下の静摩擦係数を有している。従って、このような貼着部材が貼着された平版印刷版用当て部材を、貼着部材が平版印刷版用合紙と接触するように配置するだけで、平版印刷版用合紙の平版印刷版に対する横ズレを防止できる。しかも、従来から使用されている平版印刷版用当て部材に貼着部材を貼着するだけなので、製造コストが高くなることもない。
【００１８】
貼着部材としては、平版印刷版用合紙に対して上記したような摩擦係数となる表面性状を有するものであれば特に限定されないが、例えば、請求項４に記載のように、平版印刷版の画像形成面を保護する平版印刷版用合紙と同一構成の貼着紙とすることができる。これにより、貼着部材として新たな部材を用意することなく、一般的に使用されている平版印刷版合紙を利用できるので、さらに低コストになる。また、この場合には、請求項５に記載のように、貼着紙が、平版印刷版用合紙に対する静摩擦係数が相対的に低い面が平版印刷版用合紙に接触するように当て部材本体に貼着されていると、平版印刷版用当て部材と平版印刷版用合紙との静摩擦係数がより小さくなる。
【００１９】
請求項６に記載の発明では、平版印刷版と、前記平版印刷版の塗布膜が形成された画像形成面に接触される平版印刷版用合紙と、前記平版印刷版用合紙に対し前記平版印刷版の反対側の面に接触されて平版印刷版を保護する平版印刷版用保護部材と、を有し、前記平版印刷版用保護部材と前記平版印刷版用合紙との静摩擦係数が前記平版印刷版と平版印刷版用合紙との静摩擦係数以下となるように設定されていることを特徴とする。
【００２０】
すなわち、この平版印刷版包装構造では、平版印刷版の画像形成面に平版印刷版用合紙が接触されることで、画像形成面（塗布膜）が保護される。
【００２１】
また、平版印刷版用合紙には、平版印刷版と接触する面の反対側の面に平版印刷版用保護部材が接触されており、平版印刷版の変形や傷が防止される。
【００２２】
平版印刷版用合紙及び平版印刷版用保護部材は、平版印刷版用保護部材と平版印刷版用合紙との静摩擦係数が平版印刷版と平版印刷版用合紙との静摩擦係数以下となるように設定されている。このため、例えば荷扱い時等の外力や振動等によって平版印刷版用保護部材と平版印刷版との間に横ズレが生じた場合に、平版印刷版用合紙は平版印刷版に対して横ズレせず、平版印刷版に対して平版印刷版用合紙が横ズレすることによる画像形成面の損傷を確実に防止できる。
【００２３】
平版印刷版用保護部材は、平版印刷版の変形や傷を防止できるものであれば特に限定されないが、例えば、請求項７に記載のように、請求項２〜請求項４のいずれかに記載の平版印刷版用当て部材を使用することができる。
【００２４】
請求項８に記載の発明では、請求項６又は請求項７に記載の発明において、前記平版印刷版用保護部材と前記平版印刷版用合紙との静摩擦係数Ｙと、前記平版印刷版と平版印刷版用合紙との静摩擦係数Ｘとが共に０．３７以上とされていることを特徴とする。
【００２５】
このように、平版印刷版用保護部材と平版印刷版用合紙との静摩擦係数Ｙ、及び平版印刷版と平版印刷版用合紙との静摩擦係数Ｘを共に０．３７以上とすることで、平版印刷版の画像形成面の損傷をより確実に防止できる。また、平版印刷版包装構造の荷崩れも防止できる。
【００２６】
【発明の実施の形態】
図１には、本発明の一実施形態に係る保護用厚紙（平版印刷版用当て部材）２２を使用した平版印刷版１０の積層束１２が示されている。
【００２７】
平版印刷版１０は、長方形の板状に形成された薄いアルミニウム製の支持体上に、塗布膜（感光性印刷版の場合には感光層、感熱性印刷版の場合には感熱層）を塗布して形成されている。この塗布膜に、露光、現像処理、ガム引き等の製版処理が行われ、印刷機にセットされ、インクが塗布されることで、紙面に文字、画像等が印刷される。以下、塗布膜が塗布された面を画像形成面１０Ｐといい、この反対側の面、すなわち塗布膜が塗布されていない面を非画像形成面１０Ｑという。なお、本実施形態の平版印刷版１０は、印刷に必要な処理（露光や現像等）が施される前段階のものであり、場合によっては平版印刷版原版あるいは平版印刷版材と称されることもある。
【００２８】
なお、このような構成とされていれば、平版印刷版１０の具体的構成は特に限定されないが、例えば、ヒートモード方式およびフォトン方式のレーザ刷版用の平版印刷版とすることによって、デジタルデータから直接製版可能な平版印刷版とすることができる。
【００２９】
また、平版印刷版１０は、感光層又は感熱層中の成分を種々選択することによって、種々の製版方法に対応した平版印刷版とすることができる。本発明の平版印刷版１０の具体的態様の例としては、下記（１）〜（１１）の態様が挙げられる。
（１） 感光層が赤外線吸収剤、熱によって酸を発生する化合物、および酸によって架橋する化合物を含有する態様。
（２） 感光層が赤外線吸収剤、および熱によってアルカリ溶解性となる化合物を含有する態様。
（３） 感光層が、レーザ光照射によってラジカルを発生する化合物、アルカリに可溶のバインダー、および多官能性のモノマーあるいはプレポリマーを含有する層と、酸素遮断層との２層を含む態様。
（４） 感光層が、物理現像核層とハロゲン化銀乳剤層との２層からなる態様。
（５） 感光層が、多官能性モノマーおよび多官能性バインダーとを含有する重合層と、ハロゲン化銀と還元剤を含有する層と、酸素遮断層との３層を含む態様。
（６） 感光層が、ノボラック樹脂およびナフトキノンジアジドを含有する層と、ハロゲン化銀を含有する層との２層を含む態様。
（７） 感光層が、有機光導電体を含む態様。
（８） 感光層が、レーザー光照射によって除去されるレーザー光吸収層と、親油性層および／または親水性層とからなる２〜３層を含む態様。
（９） 感光層が、エネルギーを吸収して酸を発生する化合物、酸によってスルホン酸またはカルボン酸を発生する官能基を側鎖に有する高分子化合物、および可視光を吸収することで酸発生剤にエネルギーを与える化合物を含有する態様。
（１０） 感光層が、キノンジアジド化合物と、ノボラック樹脂とを含有する態様。
（１１） 感光層が、光又は紫外線により分解して自己もしくは層内の他の分子との架橋構造を形成する化合物とアルカリに可溶のバインダーとを含有する態様。
【００３０】
特に、近年では、レーザーで露光する高感度感光タイプの塗布膜を塗布した平版印刷版や、感熱タイプの平版印刷版が使用されることもあるが（例えば上記した（１）〜（３）の態様等）、このような平版印刷版の場合には、後述するように、本実施形態の保護用厚紙２２を使用することで、画像形成面１０Ｐの損傷をより確実に防止できる。
【００３１】
そして、図１からも分かるように、画像形成面１０Ｐ（塗布膜）を保護する合紙１４と、平版印刷版１０と、を交互に厚み方向に重ね合わせ、さらにその重ね合わせ方向の端面（図１での上面及び下面）に保護用厚紙２２を配置して、平版印刷版１０の積層束１２が構成されている。従って、図２に示すように、合紙１４のうち画像形成面１０Ｐに接触する面が平版印刷版接触面１４Ａとなり、この反対側の面が、保護用厚紙２２に接触する保護用厚紙接触面１４Ｂとなる。
【００３２】
１つの積層束１２を構成する平版印刷版１０の数は特に限定されないが、運搬や保管の効率化の観点等から、例えば１０枚〜１００枚とすることができる。また、このように１０枚〜１００枚の平版印刷版１０によって積層束１２を構成した場合には、積層束１２を分離・運搬しやすくするために、必要により粘着テープでテープ止めする等により、これらを固定してもよい。また、さらに多くの平版印刷版１０によって積層束１２を構成し、より効率的に（少ない荷扱いの回数で）運搬や保管をできるようにすることも可能である。例えば、平版印刷版１０の枚数を最大で３０００枚程度とし、平版印刷版１０の２０〜１００枚ごとに保護用厚紙２２を入れるようにしてもよい。さらに、平版印刷版１０の枚数を最大で１５００枚程度とし、その上下にのみ保護用厚紙２２を配置してもよい。
【００３３】
そして、このようにして構成された積層束１２を、図３に示すように、内装紙１６によって内装し、粘着テープ２４によって内装紙１６を所定位置で張り付ける。これによって、本発明の平版印刷版包装構造１８が構成される。内装紙１６は粘着テープ２４によって不用意に広がったり脱落したりしないように固定されるので、平版印刷版１０は内装紙１６によって確実に遮光及び防湿される。なお、平版印刷版１０の種類や運搬方法等に応じ、積層束１２をさらに段ボール箱等の外装箱によって外装したり、パレットやスキッド等の積載部材（紙製、樹脂製及び金属製等、材質は特に限定されない）に積載したりして、荷扱いをより容易にしてもよい。
【００３４】
合紙１４としては、平版印刷版１０の画像形成面１０Ｐを保護できれば、具体的構成は特に限定されないが、例えば、木材パルプを１００％使用した紙や、木材パルプを１００％使用せず合成パルプを使用した紙、及びこれらの紙の表面に低密度ポリエチレン層を設けた紙等を使用できる。特に、合成パルプを使用しない紙では、材料コストが低くなるので、低コストで合紙１４を製造することができる。より具体的には、漂白クラフトパルプから抄造した坪量３０〜４５ｇ／ｍ2 、密度０．７〜０．８５ｇ／ｃｍ3 、水分４〜６％、ＰＨ４〜６の合紙が挙げられるが、もちろんこれに限定されない。
【００３５】
ここで、本実施形態の保護用厚紙２２は、平版印刷版１０を保護するために十分な強度を有する厚紙本体２６と、この厚紙本体２６の両面にラミネートされた防湿層２８を有すると共に、さらに片面又は両面（図３では片面）に貼着紙３０が貼着されることにより構成されている。
【００３６】
厚紙本体２６の材料としては、木材パルプ、麻等の天然繊維、ポリオレフィン等の線状高分子から得られる合成パルプ、再生セルロース等を単独又は混合して使用することができる。特に、木材パルプや天然繊維繊等、低コストの材用を選択することで、厚紙本体２６を低コストで製造することができる。より具体的には、例えば、原料故紙を叩解し、４％の濃度に希釈した紙料にサイズ剤を厚紙重量の０．１％、紙力剤を厚紙重量の０．２％になるように加え、さらに硫酸アルミニウムをＰＨが５．０になるまで加えた紙料を用いて抄紙して得られた密度０．７２ｇ／ｃｍ3、坪量６４０ｇ／ｍ2の厚紙本体２６を挙げることができるが、もちろんこれに限定されない。
【００３７】
防湿層２８は、例えばＬＤＰＥ（低密度ポリエチレン）等、水分透過性の低い材料によって構成されており、厚紙本体２６自体の水分が平版印刷版１０の塗布膜に影響を及ぼさないようになっている。特に、近年使用されているレーザー露光タイプの平版印刷版の場合には、厚紙本体２６の水分による塗布膜の変質を防止するために、このような防湿層２８を有する保護用厚紙２２を使用することが好ましい。逆に、塗布膜の種類によっては、厚紙本体２６の水分による影響を受けない（若しくは影響が極めて小さい）場合もあり、このような場合には防湿層２８を省略して、低コストで保護用厚紙２２を製造できるようにしてもよい。
【００３８】
貼着紙３０は合紙１４と同一構成の紙であり、防湿層２８がラミネートされるときに厚紙本体２６に一体的に貼着される。そして、平版印刷版包装構造１８を構成した状態では、貼着紙３０が合紙１４に接触するようにして、保護用厚紙２２が配置されている。従って、貼着紙３０の表面が、保護用厚紙２２における合紙接触面２２Ａとなる。そして、このように貼着紙３０が合紙１４と接触することで、保護用厚紙２２と合紙１４との静摩擦係数Ｙが、合紙１４と平版印刷版１０の画像形成面との静摩擦係数Ｘ以下（すなわちＹ≦Ｘ）となっている。
【００３９】
表１には、保護用厚紙２２及び合紙１４の各面の性状、保護用厚紙２２と合紙１４の間及び合紙１４と平版印刷版とのズレ、及び平版印刷版１０の画像形成面１０Ｐの損傷との関係が示されている。
【００４０】
この表１における「ツヤ面」とは、合紙１４の両面のうち、相対的にベック平滑度（ＪＩＳ Ｐ ８１１９に規定される）が大きい面であり、「ザラ面」とは、ベック平滑度が小さい面である。
【００４１】
また、表１のケース１及びケース２の場合では、一般的に使用されている保護用厚紙の厚紙本体に、防湿層２８としてＬＤＰＥを厚さ６０μｍでラミネートすると共に、合紙１４と同一構成の貼着紙３０を貼着している。この場合において、ケース１では合紙接触面として貼着紙３０のツヤ面が位置するようにし、ケース２の場合では貼着紙３０のザラ面が位置するようにしている。また、ケース３の場合では、貼着紙３０が貼着されていない保護用厚紙を使用し、防湿層２８であるＬＤＰＥが合紙接触面として合紙１４に接触するように配置されている。
【００４２】
【表１】

Figure 0004054157
【００４３】
この表１から、貼着紙３０が貼着された保護用厚紙２２を使用した場合（ケース１及びケース２）では、保護用厚紙２２と合紙１４とにズレが生じるが、合紙１４と平版印刷版１０とにはズレが生じないため、平版印刷版１０の画像形成面１０Ｐ（塗布膜）が損傷を受けていないことが分かる。
【００４４】
これに対し、防湿層２８（ＬＤＰＥ）が合紙１４に接触している場合（ケース３）では、合紙１４が平版印刷版１０に対してズレるため、平版印刷版１０の画像形成面１０Ｐが損傷を受けていることが分かる。
【００４５】
なお、保護用厚紙２２の合紙接触面として、貼着紙３０のツヤ面を採用した場合（ケース１）と、ザラ面を採用した場合（ケース２）とは、いずれも画像形成面１０Ｐの損傷を防止できるが、特に、ケース１では、保護用厚紙２２と合紙１４との静摩擦係数がケース２と比較して相対的に大きくなるので、例えば、過酷な条件で輸送した場合等であっても、相対的に荷ズレが起き難くなる。
【００４６】
このように、本実施形態では、貼着紙３０が貼着された保護用厚紙２２を使用し、保護用厚紙２２と合紙１４との静摩擦係数Ｙを合紙１４と平版印刷版１０との静摩擦係数Ｘよりも小さくすることで、合紙１４の平版印刷版１０に対するズレを確実に防止している。従って、平版印刷版包装構造１８（図２参照）を運搬等する場合に、例えば保護用厚紙２２に面方向の力が作用したときでも、合紙１４は平版印刷版１０に対してズレないため、平版印刷版１０の画像形成面１０Ｐは合紙１４の擦れによって損傷を受けることなく確実に保護される。
【００４７】
なお、保護用厚紙２２と合紙１４との静摩擦係数Ｙを、合紙１４と平版印刷版１０との静摩擦係数Ｘよりも小さくするための具体的構成としては、保護用厚紙２２に貼着紙３０を貼着したものに限られない。例えば、貼着紙３０は合紙１４と同一構成の紙でなくても良いし、保護用厚紙２２の合紙接触面にベック平滑度を小さくするような加工を施すことで合紙１４への密着性を低下させ、合紙１４に対する静摩擦係数Ｙを合紙１４と平版印刷版１０との静摩擦係数Ｘより小さくしてもよい。図３に示したように、合紙１４と同一構成の紙を貼着紙３０として使用すると、貼着紙３０を別途製造することなく合紙１４を貼着紙３０として兼用できるので、低コストで本発明の保護用厚紙２２を得ることが可能になる。この場合には、貼着紙３０のツヤ面とザラ面のうち、合紙１４の保護用厚紙接触面１４Ｂ（一般的にはザラ面とされるが、場合によってはツヤ面でもよい）に対してより低い静摩擦係数を有する面を外側に（すなわち合紙接触面２２Ａとなるように）して、厚紙本体２６に貼着すると、静摩擦係数Ｙをより小さくできるので好ましい。
【００４８】
また、保護用厚紙２２ではなく、合紙１４の表面性状を適切に設定することで、保護用厚紙２２と合紙１４との静摩擦係数Ｙが、合紙１４と平版印刷版１０との静摩擦係数Ｘよりも小さくなるようにしてもよい。要するに、一般的に静摩擦係数は、接触する部材によって固有の値となるので、保護用厚紙２２の表面性状を適切に設定しても、あるいは合紙１４の表面性状を適切に設定しても、結果として保護用厚紙２２と合紙１４との静摩擦係数Ｙが合紙１４と平版印刷版１０との静摩擦係数Ｘよりも小さくなっていればよい。
【００４９】
なお、保護用厚紙２２と合紙１４との静摩擦係数Ｙは、合紙１４と平版印刷版１０との静摩擦係数Ｘよりも小さければ具体的数値は限定されないが、一定値以上とすることで、保護用厚紙２２と合紙１４とのズレも防止して、平版印刷版包装構造１８の輸送時等の荷崩れを防止することも可能となる。
【００５０】
表２には、保護用厚紙２２と合紙１４との静摩擦係数Ｙ及び合紙１４と平版印刷版１０との静摩擦係数Ｘと、平版印刷版包装構造１８の荷崩れ及び画像形成面１０Ｐの損傷との関係が示されている。
【００５１】
【表２】
Figure 0004054157
【００５２】
表２から分かるように、静摩擦係数Ｙ、Ｘのいずれも０．３７以上の場合（ケース４及びケース５）には、荷崩れが防止されると共に、画像形成面１０Ｐの損傷も防止されている。
【００５３】
これに対し、静摩擦係数Ｙが０．３７より小さい場合（ケース６）には、画像形成面１０Ｐの損傷は防止されるが、荷崩れが発生している。また、静摩擦係数Ｘが０．３７より小さい場合（ケース７）でも、荷崩れが発生している。さらにこの場合には、静摩擦係数Ｙが静摩擦係数Ｘより大きいため、画像形成面１０Ｐが損傷を受けている。
【００５４】
従って、荷崩れを防止すると共に画像形成面１０Ｐの損傷も防止するためには、静摩擦係数Ｘ、Ｙのいずれも０．３７以上とすればよい。
【００５５】
【発明の効果】
請求項１に記載の発明では、平版印刷版を包装した状態で平版印刷版の塗布膜が形成された画像形成面に接触される平版印刷版接触面と、前記平版印刷版接触面の反対側に配置された平版印刷版当て部材に接触する当て部材接触面と、を有し、前記平版印刷版用当て部材と前記当て部材接触面との静摩擦係数が前記平版印刷版接触面と前記画像形成面との静摩擦係数以下となるように平版印刷版接触面及び当て部材接触面の表面性状が設定されているので、平版印刷版用合紙は平版印刷版に対して横ズレせず、画層形成面の損傷を確実に防止できる。
【００５６】
請求項２に記載の発明では、平版印刷版の塗布膜が形成された画像形成面に平版印刷版用合紙が接触された状態で、この平版印刷版用合紙の両面のうち平版印刷版の画像形成面が接触する面の反対側の面に接触されて平版印刷版を保護する平版印刷版用当て部材であって、前記平版印刷版用合紙と前記平版印刷版用当て部材との静摩擦係数が前記平版印刷版の画像形成面と平版印刷版用合紙と静摩擦係以下となるように表面性状が設定された合紙接触面、を有するので、平版印刷版用合紙は平版印刷版に対して横ズレせず、画層形成面の損傷を確実に防止できる。
【００５７】
請求項３に記載の発明では、請求項２に記載の発明において、前記合紙接触面が、前記平版印刷版用合紙に対して前記平版印刷版の画像形成面と前記平版印刷版用合紙との静摩擦係数以下の静摩擦係数を有する貼着部材を、前記平版印刷版用を構成する当て部材本体に貼着することにより構成されているので、貼着部材が平版印刷版用合紙と接触するように配置するだけで、平版印刷版用合紙の平版印刷版に対する横ズレを防止でき、製造コストが高くなることもない。
【００５８】
請求項４に記載の発明では、請求項３に記載の発明において、前記貼着部材として、前記平版印刷版の画像形成面を保護する平版印刷版用合紙と同一構成の紙が使用されているので、貼着部材として一般的に使用されている平版印刷版合紙を利用できるので、さらに低コストになる。
【００５９】
請求項５に記載の発明では、請求項４に記載の発明において、前記貼着紙が、前記平版印刷版用合紙に対する静摩擦係数が相対的に低い面が平版印刷版用合紙に接触するように前記当て部材本体に貼着されているので、平版印刷版用当て部材と平版印刷版用合紙との静摩擦係数がより小さくなる。
【００６０】
請求項６に記載の発明では、平版印刷版と、前記平版印刷版の塗布膜が形成された画像形成面に接触される平版印刷版用合紙と、前記平版印刷版用合紙に対し前記平版印刷版の反対側の面に接触されて平版印刷版を保護する平版印刷版用保護部材と、を有し、前記平版印刷版用保護部材と前記平版印刷版用合紙との静摩擦係数が前記平版印刷版と平版印刷版用合紙との静摩擦係数以下となるように設定されているので、平版印刷版用合紙は平版印刷版に対して横ズレせず、画像形成面の損傷を確実に防止できる。
【００６１】
請求項７に記載の発明では、請求項６又は請求項７に記載の発明において、前記平版印刷版用保護部材と前記平版印刷版用合紙との静摩擦係数Ｙと、前記平版印刷版と平版印刷版用合紙との静摩擦係数Ｘとが共に０．３７以上とされているので、平版印刷版の画像形成面の損傷を確実に防止できると共に、平版印刷版包装構造の荷崩れも防止できる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る平版印刷版用当て部材を使用して平版印刷版を包装する過程を示す斜視図である。
【図２】本発明の一実施形態に係る平版印刷版用当て部材を使用して平版印刷版を包装した状態を示す斜視図である。
【図３】本発明の一実施形態に係る平版印刷版用当て部材を使用したて平版印刷版を包装した状態を示す斜視図である。
【符号の説明】
１０ 平版印刷版
１０Ｐ 画像形成面
１４ 合紙（平版印刷版用合紙）
１４Ａ 平版印刷版接触面
１４Ｂ 保護用厚紙接触面（当て部材接触面）
１８ 平版印刷版包装構造
２２ 保護用厚紙（平版印刷版用当て部材）
２２Ａ 合紙接触面
３０ 貼着紙（貼着部材）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a planographic printing plate slip sheet, a planographic printing plate application member, and a planographic printing plate packaging structure.
[0002]
[Prior art]
In recent plate making methods (including electrophotographic plate making methods), lithographic printing plates such as photosensitive printing plates and heat-sensitive printing plates are widely used in order to facilitate automation of the plate making process. A lithographic printing plate is generally obtained by performing surface treatment such as graining, anodizing, silicate treatment, and other chemical conversion treatments on a support such as a sheet-like or coil-like aluminum plate alone or in combination, and then a photosensitive layer. Alternatively, a heat-sensitive layer (hereinafter collectively referred to as a “coating film”, a surface on which the coating film is applied is referred to as an “image forming surface”, and a surface on which the coating film is not formed is referred to as a “non-image forming surface”). It is manufactured by cutting to a desired size after performing a drying process.
[0003]
This lithographic printing plate is subjected to plate making processing such as exposure, development processing, and gumming, and is set in a printing machine and coated with ink, whereby characters, images, etc. are printed on the paper.
[0004]
By the way, in the planographic printing plate, in order to protect the coating film, a paper called a slip sheet may be brought into contact with the image forming surface (coating film). In particular, in order to efficiently handle a lithographic printing plate, there are cases where a plurality of lithographic printing plates are stacked in the thickness direction and handled in a state where a lithographic printing plate stack is formed. For example, the above-mentioned interleaving paper is alternately laminated with a lithographic printing plate so as to be in contact with the image forming surface, and further, a protective cardboard (referred to as a hitting ball) is provided for each end face in the laminating direction of the lithographic printing plate and every predetermined number of sheets. In many cases, the image forming surface (coating film) is protected by arranging the laminated bundle.
[0005]
However, in such a laminated bundle, if the static friction coefficient between the image forming surface of the lithographic printing plate and the slip sheet, or the static friction coefficient between the slip sheet and the protective cardboard is small, vibration or the like occurs when the laminated bundle is transported. The image forming surface may be damaged due to load collapse, or slippage of the slip sheet or protective cardboard with respect to the planographic printing plate (shift in the direction along the image forming surface of the planographic printing plate). .
[0006]
Recently, there is a lithographic printing plate of a photosensitive or thermal type (hereinafter referred to as “laser exposure type”) that draws with a laser. In such a laser exposure type lithographic printing plate, when the above-mentioned protective cardboard is used to form a laminated bundle, depending on the characteristics of the coating film, moisture contained in the protective cardboard may alter the coating film. There is a risk that. For this reason, a protective cardboard provided with a moisture-proof layer may be used as necessary. As the moisture-proof layer, a structure in which a layer of low density polyethylene (LDPE) is attached to a commonly used protective cardboard is often used.
[0007]
However, when handling a laminated bundle composed of such protective cardboard with an LDPE layer attached, the coefficient of static friction between the LDPE layer and the slip sheet is such that the slip sheet and the image forming surface of the lithographic printing plate have different static friction coefficients. Since it is relatively larger than the static friction coefficient, the slip sheet and the protective cardboard are integrally displaced with respect to the planographic printing plate due to vibration during handling. This lateral displacement may damage the image forming surface.
[0008]
[Problems to be solved by the invention]
In consideration of the above facts, the present invention prevents the lateral displacement of the lithographic printing plate interleaf with respect to the image forming surface of the lithographic printing plate, and can reliably prevent damage to the image forming surface. It is an object to obtain a printing plate contact member and a planographic printing plate packaging structure.
[0009]
[Means for Solving the Problems]
In the invention described in claim 1, the planographic printing plate contact surface that is in contact with the image forming surface on which the coating film of the planographic printing plate is formed in a state where the planographic printing plate is packaged, and the opposite side of the planographic printing plate contact surface A contact member contact surface that contacts a planographic printing plate contact member disposed on the surface, and a static friction coefficient between the contact member for the planographic printing plate and the contact surface of the contact member is the contact surface of the planographic printing plate and the image formation The surface properties of the lithographic printing plate contact surface and the contact member contact surface are set so as to be equal to or lower than the static friction coefficient with the surface.
[0010]
That is, in the planographic printing plate slip of claim 1, the lithographic printing plate contact surface comes into contact with the image forming surface of the lithographic printing plate in a state where the lithographic printing plate is packaged to protect the image forming surface (coating film).
[0011]
Further, the lithographic printing plate contact member is disposed on the opposite side of the lithographic printing plate contact surface in the packaged state, so that the lithographic printing plate contact member contacts the contact member contact surface.
[0012]
Here, the planographic printing plate slip of the present invention is such that the static friction coefficient between the lithographic printing plate contact member and the contact member contact surface is equal to or less than the static friction coefficient between the lithographic printing plate contact surface and the image forming surface. The surface properties of the printing plate contact surface and the contact member contact surface are set. For this reason, for example, when a lateral misalignment occurs between the planographic printing plate contact member and the planographic printing plate due to external force or vibration during handling, the planographic printing plate interleaves the planographic printing plate with respect to the planographic printing plate. It is possible to reliably prevent the image forming surface from being damaged due to the lateral displacement of the planographic printing plate slip sheet with respect to the planographic printing plate.
[0013]
In the invention according to claim 2, the lithographic printing plate out of both sides of the lithographic printing plate slip sheet is in a state where the lithographic printing plate slip sheet is in contact with the image forming surface on which the coating film of the lithographic printing plate is formed. A lithographic printing plate contact member that is brought into contact with a surface opposite to a surface that contacts the image forming surface of the lithographic printing plate to protect the lithographic printing plate, the lithographic printing plate interleaf and the lithographic printing plate contact member; And a slip sheet contact surface whose surface properties are set such that the static friction coefficient is less than or equal to the image forming surface of the planographic printing plate, the slip sheet for the planographic printing plate, and the static friction coefficient.
[0014]
That is, the lithographic printing plate contact member according to claim 2 is an image of a lithographic printing plate out of both sides of the lithographic printing plate interleaving paper, with respect to the lithographic printing plate interleaf contacted with the image forming surface of the lithographic printing plate. The forming surface contacts the surface opposite to the contacting surface, and protects the lithographic printing plate.
[0015]
Here, in the lithographic printing plate contact member, the static friction coefficient between the lithographic printing plate slip sheet and the lithographic printing plate contact member is less than or equal to the static friction coefficient between the image forming surface of the lithographic printing plate and the lithographic printing plate slip sheet. The surface texture is set so that For this reason, for example, when a lateral misalignment occurs between the planographic printing plate contact member and the planographic printing plate due to external force or vibration during handling, the planographic printing plate interleaf is lateral to the planographic printing plate. It is possible to reliably prevent the image forming surface from being damaged due to the slippage of the planographic printing plate with respect to the planographic printing plate.
[0016]
According to a third aspect of the present invention, in the second aspect of the present invention, the interleaf contact surface is configured such that the planographic printing plate image forming surface and the planographic printing plate combination are formed on the planographic printing plate interleaf. A sticking member having a static friction coefficient equal to or less than the static friction coefficient with paper is constituted by sticking to a contact member body constituting the planographic printing plate.
[0017]
That is, the sticking member has a static friction coefficient equal to or less than the static friction coefficient between the image forming surface of the planographic printing plate and the planographic printing plate interleaf with respect to the planographic printing plate slip sheet. Therefore, the planographic printing of the planographic printing plate slip sheet can be performed simply by arranging the planographic printing plate contact member to which the sticking member is pasted so that the sticking member is in contact with the planographic printing plate slip sheet. Lateral misalignment with the plate can be prevented. And since a sticking member is only stuck to the conventionally used lithographic printing plate contact member, manufacturing cost does not increase.
[0018]
The sticking member is not particularly limited as long as it has a surface property with a friction coefficient as described above with respect to a planographic printing plate interleaf. For example, as described in claim 4, a planographic printing plate It is possible to obtain an adhesive paper having the same configuration as that of the planographic printing plate interleaf that protects the image forming surface. This makes it possible to use a commonly used planographic printing slip sheet without preparing a new member as the sticking member, thereby further reducing the cost. Further, in this case, as described in claim 5, the sticking paper has a contact member such that a surface having a relatively low coefficient of static friction with respect to the planographic printing plate is in contact with the planographic printing plate. If it is adhered to the main body, the coefficient of static friction between the lithographic printing plate contact member and the lithographic printing plate interleaf becomes smaller.
[0019]
In the invention described in claim 6, the planographic printing plate, the planographic printing plate slip sheet in contact with the image forming surface on which the coating film of the planographic printing plate is formed, and the planographic printing plate slip sheet, the A lithographic printing plate protective member that is in contact with the opposite surface of the lithographic printing plate to protect the lithographic printing plate, and a coefficient of static friction between the lithographic printing plate protective member and the lithographic printing plate interleaf is It is set so that it may become below the static friction coefficient of the said lithographic printing plate and the interleaf for lithographic printing plates.
[0020]
That is, in this planographic printing plate packaging structure, the image forming surface (coating film) is protected by contacting the planographic printing plate slip sheet with the image forming surface of the planographic printing plate.
[0021]
Further, the planographic printing plate slip sheet has a lithographic printing plate protective member in contact with the surface opposite to the surface in contact with the lithographic printing plate, thereby preventing deformation and scratches of the lithographic printing plate.
[0022]
In the planographic printing plate slip sheet and the planographic printing plate protection member, the static friction coefficient between the planographic printing plate protection member and the planographic printing plate slip sheet is equal to or less than the static friction coefficient between the planographic printing plate and the planographic printing plate slip sheet. Is set to For this reason, for example, when a lateral displacement occurs between the lithographic printing plate protection member and the lithographic printing plate due to external force or vibration during handling, the lithographic printing plate slip is transverse to the lithographic printing plate. It is possible to reliably prevent the image forming surface from being damaged by the lateral displacement of the planographic printing plate slip sheet with respect to the planographic printing plate.
[0023]
The protective member for a lithographic printing plate is not particularly limited as long as it can prevent deformation and scratches of the lithographic printing plate. For example, as described in claim 7, the protective member for lithographic printing plate is any one of claims 2 to 4. The lithographic printing plate contact member can be used.
[0024]
According to an eighth aspect of the present invention, in the sixth or seventh aspect of the present invention, the static friction coefficient Y between the lithographic printing plate protective member and the lithographic printing plate slip sheet, the lithographic printing plate and the lithographic plate Both have a static friction coefficient X of 0.37 or more with the interleaving paper for printing plate.
[0025]
Thus, by setting both the static friction coefficient Y between the lithographic printing plate protective member and the lithographic printing plate slip sheet and the static friction coefficient X between the lithographic printing plate and the lithographic printing plate slip sheet to 0.37 or more, Damage to the image forming surface of the lithographic printing plate can be prevented more reliably. Moreover, the collapse of the planographic printing plate packaging structure can be prevented.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a laminated bundle 12 of a lithographic printing plate 10 using a protective cardboard (lithographic printing plate contact member) 22 according to an embodiment of the present invention.
[0027]
The planographic printing plate 10 is coated with a coating film (a photosensitive layer in the case of a photosensitive printing plate and a thermal layer in the case of a thermal printing plate) on a thin aluminum support formed in a rectangular plate shape. Is formed. The coating film is subjected to plate making processing such as exposure, development processing, and gumming, and is set in a printing machine, and ink is applied to print characters, images, and the like on the paper surface. Hereinafter, the surface to which the coating film is applied is referred to as an image forming surface 10P, and the opposite surface, that is, the surface to which the coating film is not applied is referred to as a non-image forming surface 10Q. Note that the lithographic printing plate 10 of the present embodiment is a stage before processing (exposure, development, etc.) necessary for printing, and is sometimes referred to as a lithographic printing plate precursor or a lithographic printing plate material. Sometimes.
[0028]
The specific configuration of the lithographic printing plate 10 is not particularly limited as long as such a configuration is used. For example, digital data can be obtained by using a lithographic printing plate for a laser printing plate of a heat mode method and a photon method. The lithographic printing plate can be made directly from the plate.
[0029]
Moreover, the lithographic printing plate 10 can be a lithographic printing plate corresponding to various plate making methods by selecting various components in the photosensitive layer or the heat-sensitive layer. Examples of specific embodiments of the lithographic printing plate 10 of the present invention include the following embodiments (1) to (11).
(1) An embodiment in which the photosensitive layer contains an infrared absorber, a compound that generates an acid by heat, and a compound that crosslinks by an acid.
(2) An embodiment in which the photosensitive layer contains an infrared absorber and a compound that becomes alkali-soluble by heat.
(3) A mode in which the photosensitive layer includes two layers of a compound that generates radicals upon irradiation with laser light, a layer containing an alkali-soluble binder, and a polyfunctional monomer or prepolymer, and an oxygen blocking layer.
(4) An embodiment in which the photosensitive layer is composed of two layers of a physical development nucleus layer and a silver halide emulsion layer.
(5) A mode in which the photosensitive layer includes three layers of a polymerization layer containing a polyfunctional monomer and a polyfunctional binder, a layer containing silver halide and a reducing agent, and an oxygen blocking layer.
(6) A mode in which the photosensitive layer includes two layers of a layer containing a novolac resin and naphthoquinone diazide and a layer containing silver halide.
(7) A mode in which the photosensitive layer contains an organic photoconductor.
(8) A mode in which the photosensitive layer includes 2 to 3 layers including a laser light absorbing layer to be removed by laser light irradiation, and a lipophilic layer and / or a hydrophilic layer.
(9) A compound in which the photosensitive layer absorbs energy to generate an acid, a polymer compound having a functional group that generates sulfonic acid or carboxylic acid by an acid in the side chain, and an acid generator by absorbing visible light The aspect containing the compound which gives energy to.
(10) The mode in which the photosensitive layer contains a quinonediazide compound and a novolac resin.
(11) A mode in which the photosensitive layer contains a compound that decomposes by light or ultraviolet rays to form a crosslinked structure with itself or other molecules in the layer and an alkali-soluble binder.
[0030]
In particular, in recent years, a lithographic printing plate coated with a high-sensitivity photosensitive type coating film that is exposed by a laser or a heat-sensitive lithographic printing plate may be used (for example, the above-described (1) to (3)). In the case of such a lithographic printing plate, the damage of the image forming surface 10P can be more reliably prevented by using the protective cardboard 22 of the present embodiment, as will be described later.
[0031]
As can be seen from FIG. 1, the slip sheet 14 that protects the image forming surface 10 </ b> P (coating film) and the planographic printing plate 10 are alternately overlapped in the thickness direction, and the end surfaces in the overlapping direction (see FIG. 1). The upper and lower surfaces in FIG. 1 are provided with protective cardboard 22 to form a laminated bundle 12 of the planographic printing plate 10. Therefore, as shown in FIG. 2, the surface of the interleaf paper 14 that contacts the image forming surface 10 </ b> P becomes the planographic printing plate contact surface 14 </ b> A, and the opposite surface is the protective cardboard contact surface that contacts the protective cardboard 22. 14B.
[0032]
The number of lithographic printing plates 10 constituting one laminated bundle 12 is not particularly limited, but may be, for example, 10 to 100 from the viewpoint of efficiency of transportation and storage. In addition, when the laminated bundle 12 is constituted by 10 to 100 lithographic printing plates 10 in this way, in order to make the laminated bundle 12 easy to separate and transport, it is taped with an adhesive tape as necessary. These may be fixed. It is also possible to configure the laminated bundle 12 with more lithographic printing plates 10 so that it can be transported and stored more efficiently (with a small number of times of handling of cargo). For example, the maximum number of planographic printing plates 10 may be about 3000, and the protective cardboard 22 may be inserted for every 20 to 100 planographic printing plates 10. Furthermore, the maximum number of planographic printing plates 10 may be about 1500, and the protective cardboard 22 may be disposed only above and below the planographic printing plate 10.
[0033]
Then, as shown in FIG. 3, the laminated bundle 12 configured in this way is internally provided with an interior paper 16, and the interior paper 16 is attached at a predetermined position with an adhesive tape 24. This constitutes the planographic printing plate packaging structure 18 of the present invention. Since the inner paper 16 is fixed by the adhesive tape 24 so as not to spread unintentionally or drop off, the planographic printing plate 10 is reliably shielded from light and moisture by the inner paper 16. Depending on the type of lithographic printing plate 10 and the transportation method, the laminated bundle 12 is further covered with an outer box such as a cardboard box, or a stacking member such as a pallet or skid (made of paper, resin, metal, etc.) May be loaded) to make handling easier.
[0034]
The interleaf sheet 14 is not particularly limited in its specific configuration as long as the image forming surface 10P of the planographic printing plate 10 can be protected. For example, paper using 100% wood pulp or synthetic pulp without using 100% wood pulp. And paper having a low-density polyethylene layer on the surface of these papers. In particular, in the paper which does not use synthetic pulp, since the material cost becomes low, the interleaf paper 14 can be manufactured at low cost. More specifically, basis weight 30-45 g / m made from bleached kraft pulp. 2 A slip sheet having a density of 0.7 to 0.85 g / cm 3, a moisture content of 4 to 6%, and a pH of 4 to 6 is, of course, not limited thereto.
[0035]
Here, the protective cardboard 22 of the present embodiment has a cardboard body 26 having sufficient strength to protect the planographic printing plate 10, and a moisture-proof layer 28 laminated on both surfaces of the cardboard body 26. It is configured by sticking the sticking paper 30 on one side or both sides (one side in FIG. 3).
[0036]
As a material of the cardboard body 26, natural pulp such as wood pulp, hemp or the like, synthetic pulp obtained from a linear polymer such as polyolefin, regenerated cellulose, or the like can be used alone or in combination. In particular, the cardboard body 26 can be manufactured at a low cost by selecting a low-cost material such as wood pulp or natural fiber fiber. More specifically, for example, raw material waste paper is beaten, and the sizing agent is 0.1% of the cardboard weight and the paper strength agent is 0.2% of the cardboard weight in the paper stock diluted to a concentration of 4%. In addition, a density of 0.72 g / cm obtained by paper making using a paper material in which aluminum sulfate was further added until the pH became 5.0 Three , Basis weight 640g / m 2 However, the present invention is not limited to this.
[0037]
The moisture-proof layer 28 is made of a material having low moisture permeability, such as LDPE (low density polyethylene), and the moisture of the cardboard body 26 itself does not affect the coating film of the lithographic printing plate 10. . In particular, in the case of a lithographic printing plate of the laser exposure type that has been used in recent years, the protective cardboard 22 having such a moisture-proof layer 28 is used in order to prevent the coating film from being altered by moisture in the cardboard body 26. It is preferable. On the other hand, depending on the type of coating film, the cardboard body 26 may not be affected by moisture (or the influence is extremely small). In such a case, the moisture-proof layer 28 is omitted, and the protective film is used at low cost. The cardboard 22 may be manufactured.
[0038]
The sticking paper 30 is a paper having the same configuration as that of the interleaf paper 14, and is stuck to the cardboard main body 26 integrally when the moisture-proof layer 28 is laminated. And in the state which comprised the lithographic printing plate packaging structure 18, the protective cardboard 22 is arrange | positioned so that the sticking paper 30 may contact the slip sheet 14. FIG. Therefore, the surface of the sticking paper 30 becomes the slip sheet contact surface 22 </ b> A of the protective cardboard 22. And the sticking paper 30 contacts the slip sheet 14 in this way, so that the static friction coefficient Y between the protective cardboard 22 and the slip sheet 14 is the static friction coefficient between the slip sheet 14 and the image forming surface of the planographic printing plate 10. X or less (that is, Y ≦ X).
[0039]
Table 1 shows the properties of each surface of the protective cardboard 22 and the interleaf paper 14, the gap between the protective cardboard 22 and the interleaf paper 14, and the gap between the interleaf paper 14 and the planographic printing plate, and the image forming surface of the planographic printing plate 10 The relationship with 10P damage is shown.
[0040]
The “shiny surface” in Table 1 is a surface having a relatively large Beck smoothness (as defined in JIS P 8119) out of both surfaces of the interleaf paper 14, and the “zara surface” is a Beck smoothness. Is a small surface.
[0041]
In case 1 and case 2 in Table 1, LDPE is laminated with a thickness of 60 μm as a moisture-proof layer 28 on a generally used cardboard body of protective cardboard, and has the same configuration as the interleaf paper 14. The sticking paper 30 is stuck. In this case, the glossy surface of the sticking paper 30 is positioned as the interleaf contact surface in the case 1, and the rough surface of the sticking paper 30 is positioned in the case 2. Further, in the case 3, protective cardboard to which the sticker paper 30 is not stuck is used, and the LDPE that is the moisture-proof layer 28 is disposed so as to contact the slip sheet 14 as a slip sheet contact surface.
[0042]
[Table 1]
Figure 0004054157
[0043]
From Table 1, when the protective cardboard 22 with the adhesive paper 30 attached is used (case 1 and case 2), the protective cardboard 22 and the slip sheet 14 are misaligned. Since no deviation occurs with the planographic printing plate 10, it can be seen that the image forming surface 10P (coating film) of the planographic printing plate 10 is not damaged.
[0044]
On the other hand, when the moisture-proof layer 28 (LDPE) is in contact with the slip sheet 14 (case 3), the slip sheet 14 is displaced from the planographic printing plate 10, so that the image forming surface 10P of the planographic printing plate 10 is You can see that it is damaged.
[0045]
The case where the glossy surface of the sticking paper 30 is used as the slip sheet contact surface of the protective cardboard 22 (Case 1) and the case where the rough surface is used (Case 2) are both on the image forming surface 10P. Although damage can be prevented, in particular, in case 1, the coefficient of static friction between the protective cardboard 22 and the interleaf paper 14 is relatively larger than that in case 2, and thus, for example, when transported under severe conditions. However, it is relatively difficult for misalignment to occur.
[0046]
As described above, in the present embodiment, the protective cardboard 22 to which the adhesive paper 30 is attached is used, and the static friction coefficient Y between the protective cardboard 22 and the interleaf paper 14 is determined between the interleaf paper 14 and the planographic printing plate 10. By making it smaller than the static friction coefficient X, the slip of the interleaf paper 14 with respect to the planographic printing plate 10 is surely prevented. Therefore, when transporting the lithographic printing plate packaging structure 18 (see FIG. 2), for example, even when a surface force is applied to the protective cardboard 22, the slip sheet 14 is not displaced from the lithographic printing plate 10. The image forming surface 10P of the planographic printing plate 10 is reliably protected without being damaged by the rubbing of the interleaf paper 14.
[0047]
As a specific configuration for reducing the static friction coefficient Y between the protective cardboard 22 and the interleaf paper 14 to be smaller than the static friction coefficient X between the interleaf paper 14 and the planographic printing plate 10, the sticking paper is attached to the protective cardboard 22. It is not restricted to what stuck 30. For example, the sticking paper 30 may not be a paper having the same configuration as that of the interleaving paper 14, or the interfacing contact surface of the protective cardboard 22 may be processed to reduce the Beck smoothness. The adhesiveness may be reduced, and the static friction coefficient Y with respect to the slip sheet 14 may be made smaller than the static friction coefficient X between the slip sheet 14 and the lithographic printing plate 10. As shown in FIG. 3, when a paper having the same configuration as that of the interleaf paper 14 is used as the adhesive paper 30, the interleaf paper 14 can be used as the adhesive paper 30 without separately manufacturing the adhesive paper 30. Thus, the protective cardboard 22 of the present invention can be obtained. In this case, of the glossy surface and the rough surface of the sticking paper 30, the protective cardboard contact surface 14B for the interleaf paper 14 (generally a rough surface, but may be a glossy surface in some cases). It is preferable that the surface having a lower static friction coefficient be outside (that is, the slip sheet contact surface 22A) and stuck to the cardboard body 26 because the static friction coefficient Y can be further reduced.
[0048]
In addition, by appropriately setting the surface properties of the interleaf paper 14 instead of the protective cardboard 22, the static friction coefficient Y between the protective cardboard 22 and the interleaf paper 14 is changed to the static friction coefficient between the interleaf paper 14 and the planographic printing plate 10. It may be made smaller than X. In short, since the coefficient of static friction generally has a specific value depending on the member to be contacted, even if the surface property of the protective cardboard 22 is appropriately set or the surface property of the interleaf paper 14 is appropriately set, As a result, the static friction coefficient Y between the protective cardboard 22 and the slip sheet 14 should be smaller than the static friction coefficient X between the slip sheet 14 and the planographic printing plate 10.
[0049]
Note that the specific numerical value of the static friction coefficient Y between the protective cardboard 22 and the interleaf paper 14 is not limited as long as it is smaller than the static friction coefficient X between the interleaf paper 14 and the planographic printing plate 10, but by setting it to a certain value or more, It is also possible to prevent the protective cardboard 22 and the slip sheet 14 from being misaligned, and to prevent collapse of the planographic printing plate packaging structure 18 during transportation.
[0050]
Table 2 shows the static friction coefficient Y between the protective cardboard 22 and the interleaf paper 14, the static friction coefficient X between the interleaf paper 14 and the planographic printing plate 10, the load collapse of the planographic printing plate packaging structure 18 and the damage on the image forming surface 10P. The relationship is shown.
[0051]
[Table 2]
Figure 0004054157
[0052]
As can be seen from Table 2, when both of the static friction coefficients Y and X are 0.37 or more (case 4 and case 5), the collapse of the load is prevented and the image forming surface 10P is also prevented from being damaged. .
[0053]
On the other hand, when the static friction coefficient Y is smaller than 0.37 (case 6), damage to the image forming surface 10P is prevented, but load collapse has occurred. Even when the static friction coefficient X is smaller than 0.37 (case 7), the load collapse has occurred. Further, in this case, since the static friction coefficient Y is larger than the static friction coefficient X, the image forming surface 10P is damaged.
[0054]
Therefore, in order to prevent the collapse of the load and the damage of the image forming surface 10P, both the static friction coefficients X and Y may be set to 0.37 or more.
[0055]
【The invention's effect】
In the invention described in claim 1, the planographic printing plate contact surface that is in contact with the image forming surface on which the coating film of the planographic printing plate is formed in a state where the planographic printing plate is packaged, and the opposite side of the planographic printing plate contact surface A contact member contact surface that contacts a planographic printing plate contact member disposed on the surface, and a static friction coefficient between the contact member for the planographic printing plate and the contact surface of the contact member is the contact surface of the planographic printing plate and the image formation Since the surface properties of the lithographic printing plate contact surface and the contact member contact surface are set so as to be less than the static friction coefficient with the surface, the planographic printing plate interleaf does not shift laterally with respect to the lithographic printing plate, and the image layer Damage to the forming surface can be reliably prevented.
[0056]
In the invention according to claim 2, the lithographic printing plate out of both sides of the lithographic printing plate slip sheet is in a state where the lithographic printing plate slip sheet is in contact with the image forming surface on which the coating film of the lithographic printing plate is formed. A lithographic printing plate contact member that is brought into contact with a surface opposite to the surface that contacts the image forming surface of the lithographic printing plate to protect the lithographic printing plate, the lithographic printing plate slip sheet and the lithographic printing plate contact member Since the lithographic printing plate has the image forming surface of the lithographic printing plate, the lithographic printing plate slip sheet, and the slip sheet contact surface whose surface properties are set so as to be less than or equal to the static friction coefficient, the lithographic printing plate slip sheet is lithographic printing It is possible to reliably prevent damage to the image forming surface without causing lateral displacement with respect to the plate.
[0057]
According to a third aspect of the present invention, in the second aspect of the present invention, the interleaf contact surface is configured such that the planographic printing plate image forming surface and the planographic printing plate combination are formed on the planographic printing plate interleaf. Since the sticking member having a static friction coefficient equal to or less than the static friction coefficient with the paper is constituted by sticking to the abutting member body constituting the planographic printing plate, the sticking member is a planographic printing plate interleaf. By simply placing them in contact with each other, it is possible to prevent lateral displacement of the planographic printing plate with respect to the planographic printing plate, and the manufacturing cost does not increase.
[0058]
According to a fourth aspect of the present invention, in the invention according to the third aspect, a paper having the same configuration as that of a planographic printing plate slip sheet for protecting an image forming surface of the planographic printing plate is used as the sticking member. Therefore, since the planographic printing plate interleaf generally used as the sticking member can be used, the cost is further reduced.
[0059]
According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the surface of the adhesive paper that has a relatively low coefficient of static friction with respect to the lithographic printing plate interleaf contacts the lithographic printing plate interleaf. Thus, since it is stuck to the said abutting member main body, the static friction coefficient of the abutting member for lithographic printing plates and the interleaf for lithographic printing plates becomes smaller.
[0060]
In the invention described in claim 6, the planographic printing plate, the planographic printing plate slip sheet in contact with the image forming surface on which the coating film of the planographic printing plate is formed, and the planographic printing plate slip sheet, the A lithographic printing plate protective member that is in contact with the opposite surface of the lithographic printing plate to protect the lithographic printing plate, and a coefficient of static friction between the lithographic printing plate protective member and the lithographic printing plate interleaf is Since the static friction coefficient between the lithographic printing plate and the lithographic printing plate slip sheet is set to be less than or equal to the lithographic printing plate slip sheet, the lithographic printing plate slip sheet is not shifted laterally and damages the image forming surface. It can be surely prevented.
[0061]
According to a seventh aspect of the present invention, in the sixth or seventh aspect of the present invention, the static friction coefficient Y between the lithographic printing plate protective member and the lithographic printing plate interleaf, the lithographic printing plate and the lithographic plate Since both the static friction coefficient X with the printing plate interleaving sheet is 0.37 or more, it is possible to reliably prevent damage to the image forming surface of the lithographic printing plate and to prevent collapse of the lithographic printing plate packaging structure. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing a process of packaging a lithographic printing plate using a lithographic printing plate contact member according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a state in which a planographic printing plate is packaged using a planographic printing plate contact member according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a state in which a planographic printing plate is packaged using a planographic printing plate contact member according to an embodiment of the present invention.
[Explanation of symbols]
10 Planographic printing plate
10P Image forming surface
14 Interleaf (Lithographic printing plate)
14A Planographic printing plate contact surface
14B Protection cardboard contact surface (contacting member contact surface)
18 Lithographic printing plate packaging structure
22 Protective cardboard (lithographic printing plate contact member)
22A Interleaf contact surface
30 Adhesive paper (adhesive material)

Claims (8)

平版印刷版を包装した状態で平版印刷版の塗布膜が形成された画像形成面に接触される平版印刷版接触面と、
前記平版印刷版接触面の反対側に配置された平版印刷版当て部材に接触する当て部材接触面と、
を有し、
前記平版印刷版用当て部材と前記当て部材接触面との静摩擦係数が前記平版印刷版接触面と前記画像形成面との静摩擦係数以下となるように平版印刷版接触面及び当て部材接触面の表面性状が設定されていることを特徴とする平版印刷版用合紙。A lithographic printing plate contact surface in contact with an image forming surface on which a coating film of the lithographic printing plate is formed in a state where the lithographic printing plate is packaged;
A contact member contact surface that contacts a lithographic printing plate contact member disposed on the opposite side of the lithographic printing plate contact surface;
Have
Surfaces of the lithographic printing plate contact surface and the contact member contact surface so that a static friction coefficient between the contact member for the planographic printing plate and the contact surface of the contact member is equal to or less than a static friction coefficient between the contact surface of the planographic printing plate and the image forming surface. An interleaving paper for a lithographic printing plate characterized in that the properties are set. 平版印刷版の塗布膜が形成された画像形成面に平版印刷版用合紙が接触された状態で、この平版印刷版用合紙の両面のうち平版印刷版の画像形成面が接触する面の反対側の面に接触されて平版印刷版を保護する平版印刷版用当て部材であって、
前記平版印刷版用合紙と前記平版印刷版用当て部材との静摩擦係数が前記平版印刷版の画像形成面と平版印刷版用合紙と静摩擦係以下となるように表面性状が設定された合紙接触面、
を有することを特徴とする平版印刷版用当て部材。In a state where the lithographic printing plate slip sheet is in contact with the image forming surface on which the coating film of the lithographic printing plate is formed, the surface of the lithographic printing plate slip sheet which is in contact with the image forming surface of the lithographic printing plate A contact member for a lithographic printing plate that is brought into contact with the opposite surface to protect the lithographic printing plate,
The surface property is set so that the static friction coefficient between the lithographic printing plate slip sheet and the lithographic printing plate contact member is less than or equal to the image forming surface of the lithographic printing plate and the lithographic printing plate slip sheet. Paper contact surface,
A lithographic printing plate abutting member comprising: 前記合紙接触面が、
前記平版印刷版用合紙に対して前記平版印刷版の画像形成面と前記平版印刷版用合紙との静摩擦係数以下の静摩擦係数を有する貼着部材を、前記平版印刷版用を構成する当て部材本体に貼着することにより構成されていることを特徴とする請求項２に記載の平版印刷版用当て部材。The slip sheet contact surface is
A sticking member having a static friction coefficient equal to or lower than the static friction coefficient between the image forming surface of the lithographic printing plate and the lithographic printing plate interleaving paper with respect to the lithographic printing plate interleaf The lithographic printing plate abutting member according to claim 2, wherein the lithographic printing plate abutting member is formed by sticking to a member main body. 前記貼着部材として、前記平版印刷版の画像形成面を保護する平版印刷版用合紙と同一構成の貼着紙が使用されていることを特徴とする請求項３に記載の平版印刷版用当て部材。The lithographic printing plate as claimed in claim 3, wherein an adhesive paper having the same configuration as the lithographic printing plate slip sheet protecting the image forming surface of the lithographic printing plate is used as the adhesive member. Contact member. 前記貼着紙が、前記平版印刷版用合紙に対する静摩擦係数が相対的に低い面が平版印刷版用合紙に接触するように前記当て部材本体に貼着されていることを特徴とする請求項４に記載の平版印刷版用当て部材。The said sticking paper is stuck to the said contact member main body so that the surface with a relatively low static friction coefficient with respect to the said lithographic printing plate interleaving paper may contact with the lithographic printing plate interleaving paper. Item 5. The lithographic printing plate contact member according to Item 4. 平版印刷版と、
前記平版印刷版の塗布膜が形成された画像形成面に接触される平版印刷版用合紙と、
前記平版印刷版用合紙に対し前記平版印刷版の反対側の面に接触されて平版印刷版を保護する平版印刷版用保護部材と、
を有し、
前記平版印刷版用保護部材と前記平版印刷版用合紙との静摩擦係数が前記平版印刷版と平版印刷版用合紙との静摩擦係数以下となるように設定されていることを特徴とする平版印刷版包装構造。A lithographic printing plate;
A planographic printing plate slip sheet in contact with the image forming surface on which the coating film of the planographic printing plate is formed,
A protective member for a lithographic printing plate that is brought into contact with the opposite surface of the lithographic printing plate to protect the lithographic printing plate with respect to the planographic printing plate;
Have
A lithographic plate characterized in that a static friction coefficient between the lithographic printing plate protective member and the lithographic printing plate slip sheet is set to be equal to or less than a static friction coefficient between the lithographic printing plate and the lithographic printing plate slip sheet. Printing plate packaging structure. 前記平版印刷版用保護部材として、請求項２〜請求項４のいずれかに記載の平版印刷版用当て部材が使用されていることを特徴とする請求項６に記載の平版印刷版包装構造。The lithographic printing plate packaging structure according to claim 6, wherein the lithographic printing plate contact member according to any one of claims 2 to 4 is used as the lithographic printing plate protective member. 前記平版印刷版用保護部材と前記平版印刷版用合紙との静摩擦係数Ｙと、前記平版印刷版と平版印刷版用合紙との静摩擦係数Ｘとが共に０．３７以上とされていることを特徴とする請求項６又は請求項７に記載の平版印刷版包装構造。The static friction coefficient Y between the lithographic printing plate protective member and the lithographic printing plate slip sheet and the static friction coefficient X between the lithographic printing plate and the lithographic printing plate slip sheet are both 0.37 or more. The lithographic printing plate packaging structure according to claim 6 or 7, wherein:
JP2000058515A 2000-03-03 2000-03-03 Planographic printing plate interleaving paper, planographic printing plate contact member, and planographic printing plate packaging structure Expired - Fee Related JP4054157B2 (en)

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EP01104193A EP1136282B1 (en) 2000-03-03 2001-02-21 Interleaf sheet for planographic printing plates, abutting member for planographic printing plates, and packaging structure for planographic printing plates
AT01104193T ATE380118T1 (en) 2000-03-03 2001-02-21 BULLET FILM, ADJACENT BAR ELEMENT AND PACKAGING STRUCTURE FOR FLAT PLATE PLATE
DE60131692T DE60131692T2 (en) 2000-03-03 2001-02-21 Bullet film, adjacent bar element and packing structure for planographic printing plate
CNB011092793A CN1223495C (en) 2000-03-03 2001-03-02 Flat-bed printing platen slip sheet, flat-bed printing platen adjoining elements and flat-bed printing platen packaging structure
US09/797,774 US6551696B2 (en) 2000-03-03 2001-03-05 Interleaf sheet for planographic printing plates, abutting member for planographic printing plates, and packaging structure for planographic printing plates

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